553145665 has 4 divisors (see below), whose sum is σ = 663774804. Its totient is φ = 442516528.

The previous prime is 553145633. The next prime is 553145669. The reversal of 553145665 is 566541355.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 566541355 = 5 ⋅113308271.

It can be written as a sum of positive squares in 2 ways, for example, as 198049329 + 355096336 = 14073^2 + 18844^2 .

It is a cyclic number.

It is not a de Polignac number, because 553145665 - 2⁵ = 553145633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (553145669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55314562 + ... + 55314571.

It is an arithmetic number, because the mean of its divisors is an integer number (165943701).

Almost surely, 2^553145665 is an apocalyptic number.

It is an amenable number.

553145665 is a deficient number, since it is larger than the sum of its proper divisors (110629139).

553145665 is a wasteful number, since it uses less digits than its factorization.

553145665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110629138.

The product of its digits is 270000, while the sum is 40.

The square root of 553145665 is about 23519.0489816234. The cubic root of 553145665 is about 820.8803083277.

The spelling of 553145665 in words is "five hundred fifty-three million, one hundred forty-five thousand, six hundred sixty-five".